Chem Exam 1

Question 1

Mass Number

Answer 1

Number of protons + neutrons (A)

Question 2

Atomic Number

Answer 2

Number of protons (Z)

Question 3

Kelvin TO Celcius

Answer 3

K= C + 273

Question 4

Celcius TO Kelvin

Answer 4

C= K -273

Question 5

Exact Numbers

Answer 5

DEFINED values or are obtained by COUNTING

Question 6

Inexact Numbers

Answer 6

obtained by MEASUREMENTS BUT counting (speed, mass, temp. length, volume)

Question 7

Accuracy

Answer 7

Closness to experimental measures are to the REAL value

Question 8

Precision

Answer 8

How close repeated measurements are to EACHOTHER (personal numbers, real number noes NOT matter)

Question 9

Isotope

Answer 9

has same atomic number (Z) but different mass number (A)

Same protons but different nuetrons

Question 10

Proton

Answer 10

Pos charged atom in center of the atom

Question 11

Electron

Answer 11

Neg charged particle

Less mass

Question 12

Ion

Answer 12

Charged,

Question 13

Cation

Answer 13

+ charge, (more p than e)

Question 14

Sig Fig

. –>

Answer 14

Neg Sig Fig

Question 15

Sig Fig

<—.

Answer 15

Pos Sig Fig

Question 16

Element

Answer 16

Only 1 kind of atom

Question 17

Compound

Answer 17

has 2 or more elements in fixed proportions

is a substance

(don’t need to be equal amounts, only that its the same every time)

Question 18

Physical Change

Answer 18

State of matter changes but OG substance does NOT change

EX: Melting, freezing, boiling

Exception: Dissolving. Sugar dissolving in water

Question 19

Chemical Change

Answer 19

Change in composition, OG substances NO longer exist

EX: Burning, digestion, oxidation

Question 20

Physical Property

Answer 20

Obsorbed and measured w/ OUT changing identity

EX: Color, density, melting point, boiling point

Question 21

Chemical Property

Answer 21

Requires substance to change in composition

EX: Reactivity, flammability

Question 22

Directly proportional

Answer 22

One variable increases then OTHER variable increase

Question 23

Inversely Proportional

Answer 23

One variable increase, OTHER does NOT

Question 24

Average Mass

Answer 24

(Natural decimal 1)(Value 1 aka amu mass) + (Natural decimal 2)(Value 2 aka amu mass)

Question 25

Potential Energy

Answer 25

Energy passed by object by virtue in its possession

Question 26

Like Charges

Answer 26

++

AVOID each other
Together: Higher energy, less stable
Apart: Lower energy, more stable

Question 27

Opposite charges

Answer 27

+-

ATTRACTED to eachother
Together: Lower energy, Higher stability
Apart: Higher energy, less stable

Question 28

Anion

Answer 28

• charge (more e that p)

Question 29

Subatomic Particles

Answer 29

Proton
Nuetron
Electron (smaller mass BUT more volume)

Question 30

How many verticle rows in the periodic table

Answer 30

15

Question 31

Row 1 A

Answer 31

Alkali Metal

Question 32

Row 2 A

Answer 32

Alkaline Earth Metal

Question 33

Row 3B-1B

Answer 33

Transitional Metals

Question 34

Row 6 A

Answer 34

Chalcogens

Question 35

Row 7 A

Answer 35

Halogens

Question 36

8 A

Answer 36

Noble Gas

Question 37

Horizontal Row

Answer 37

Period

Question 38

Solid –> Liquid –> Gas

Answer 38

Melting –> Vaporization

Question 39

Solid –> Gas

Answer 39

Sublimation

Question 40

Gas –> Liquid –> Solid

Answer 40

Condensation –> Freezing

Question 41

Gas –> Solid

Answer 41

Deposition

Question 42

Homogeneous Mixture

Answer 42

Uniform (solution)

EX: Sweet tea, air

Question 43

Heterogeneous Mixture

Answer 43

Non- Uniform

EX: Italian dressing, trail mix

Question 44

Molecule

Answer 44

has more than 1 element

Question 45

Avo #

Answer 45

6.022 x 10^23

Equals to 1 atom

Inverse of 1 mol

Question 46

Mol

Answer 46

1 mol = atomic mass of element

Inverse of Avo

Question 47

Allotrops

Answer 47

two or more different physical forms in which an element can exist.
EX: Graphite, charcoal, and diamond are all allotropes of carbo

Question 48

monomers

Answer 48

atoms or small molecules that bond together to form more complex structures such as polymers